[Amps] Plasma RF amp Boards

["Gene Bigham" <jbigham2@kc.rr.com>]

The closest I have come to a match so far is SD1728 or Thompson TH430B.  Again, 
if anyone has further information it would be appreciated. Numbers on the 
transistors are ST 681033 with either C589C or C795V also stamped.  These are 
50 volt devices.
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